Diet Doc researchers have spent decades modifying and modernizing the original A.T.W. Simeons hCG diet plans, developing the only modern day version of the original 500 calorie Simeons diet. hCG, or human gonadotropin, discovered in the 1950’s to effect weight gain, when used in conjunction with an extremely low calorie diet, did produce fast weight loss; however, the dangerously low 500 calorie diet also posed significant and serious health risks to the dieter. Diet Doc does not promote Simeons’ 500-calorie per day diet and has modified this out-of-date protocol, increasing the daily allowable caloric intake to over 1000, and providing each patient with tailor-made diet plans specific to individual nutritional requirements based on age, gender, medical history, and activity level.